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Subsequent Events - Additional Information (Detail) (Cable access business [Member], Subsequent Event [Member], USD $) In Millions, unless otherwise specified | 1 Months Ended
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Feb. 18, 2013
Cable access business [Member] | Subsequent Event [Member] |
Subsequent Event [Line Items] |
Business sold for cash agreed by the company | $ 46

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- Definition Aggregate cash proceeds received from a combination of transactions in which noncurrent assets are sold, which may include the sale of a business, an investment in an affiliate (including an equity method investee), property, plant and equipment and intangible assets. Excludes sales of trading, available-for-sale, and held-to-maturity securities. + References No definition available. + Details
Name: | us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration